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Dr Stathis Tingas' Outputs (70)

Computational investigation of ammonia-hydrogen peroxide blends in HCCI engine mode (2022)
Journal Article
Shafiq, O., & Tingas, E.-A. (2023). Computational investigation of ammonia-hydrogen peroxide blends in HCCI engine mode. International Journal of Engine Research, 24(5), 2279-2294. https://doi.org/10.1177/14680874221117686

The potential use of hydrogen peroxide as an ignition promoter to enable the use of ammonia in compression ignition engines is explored in the current study. A simplified numerical HCCI engine model within the Chemkin Pro suite is employed. The numer... Read More about Computational investigation of ammonia-hydrogen peroxide blends in HCCI engine mode.

Numerical analysis of zero-carbon HCCI engine fuelled with steam diluted H2/H2O2 blends (2022)
Journal Article
Fernie, O., Megaritis, T., Ganippa, L. C., & Tingas, E.-A. (2022). Numerical analysis of zero-carbon HCCI engine fuelled with steam diluted H2/H2O2 blends. Fuel, 326, Article 125100. https://doi.org/10.1016/j.fuel.2022.125100

The addition of hydrogen peroxide and steam to a hydrogen-fuelled HCCI engine was investigated at various fuel lean conditions ( = 0.2–0.6) and compression ratios (15–20) using a 0-dimensional numerical model. The use of hydrogen peroxide as an ignit... Read More about Numerical analysis of zero-carbon HCCI engine fuelled with steam diluted H2/H2O2 blends.

Computational analysis of an HCCI engine fuelled with hydrogen/hydrogen peroxide blends (2022)
Journal Article
Dimitrova, I. D., Megaritis, T., Ganippa, L. C., & Tingas, E.-A. (2022). Computational analysis of an HCCI engine fuelled with hydrogen/hydrogen peroxide blends. International Journal of Hydrogen Energy, 47(17), 10083-10096. https://doi.org/10.1016/j.ijhydene.2022.01.093

In the current work, Chemkin Pro's HCCI numerical model is used in order to explore the feasibility of using hydrogen in a dual fuel concept where hydrogen peroxide acts as ignition promoter. The analysis focuses on the engine performance characteris... Read More about Computational analysis of an HCCI engine fuelled with hydrogen/hydrogen peroxide blends.

Computational investigation of the chemical dynamics in detonation development at SI engine conditions (2021)
Presentation / Conference Contribution
Dimitrova, I. D., Sanal, S., Bau Luong, M., Tingas, S., & Im, H. G. (2021, November). Computational investigation of the chemical dynamics in detonation development at SI engine conditions. Paper presented at 74th Annual Meeting of the APS Division of Fluid Dynamics, Phoenix, Arizona

This study employs algorithmic tools from the computational singular perturbation (CSP) approach and statistics to investigate detonation development in SI engines using 2D simulations at different intensity levels – strong and mild detonations. The... Read More about Computational investigation of the chemical dynamics in detonation development at SI engine conditions.

Identification of Key Processes and Periods in a Model of Human Brain Energy Metabolism by Algorithmic Decomposition with Computational Singular Perturbation (2021)
Presentation / Conference Contribution
Patsatzis, D., Tingas, S., Sarathy, M., Goussis, D., & Jolivet, R. (2021, July). Identification of Key Processes and Periods in a Model of Human Brain Energy Metabolism by Algorithmic Decomposition with Computational Singular Perturbation. Paper presented at XV European Meeting on Glial Cells in Health and Disease, Online

Energetic considerations play a crucial role in brain function and disease. The study of brainenergy metabolism is, however, rendered difficult by a relative lack of experimental tools thatcan probe the contributions of different intri... Read More about Identification of Key Processes and Periods in a Model of Human Brain Energy Metabolism by Algorithmic Decomposition with Computational Singular Perturbation.

Statistics of local and global flame speed and structure for highly turbulent H2/air premixed flames (2021)
Journal Article
Song, W., Hernández Pérez, F. E., Tingas, E.-A., & Im, H. G. (2021). Statistics of local and global flame speed and structure for highly turbulent H2/air premixed flames. Combustion and Flame, 232, Article 111523. https://doi.org/10.1016/j.combustflame.2021.111523

A statistical analysis is conducted for turbulent hydrogen-air premixed flames at a range of Karlovitz numbers up to 1,126 by direct numerical simulations (DNS) with detailed chemistry. The local and global burning velocities are evaluated and the de... Read More about Statistics of local and global flame speed and structure for highly turbulent H2/air premixed flames.

Potential for Carbon-Neutral Advanced Biofuels in UK Road Transport (2021)
Journal Article
King, R., & Tingas, E.-A. (2021). Potential for Carbon-Neutral Advanced Biofuels in UK Road Transport. Journal of Energy Engineering, 147(4), 04021025. https://doi.org/10.1061/%28asce%29ey.1943-7897.0000775

As a result of anthropocentric climate change, there is an urgent need to decarbonize the supply of energy. Organic biomass, referred to as feedstock, can be converted into biofuels that have the potential to decarbonize transport. However, biofuels... Read More about Potential for Carbon-Neutral Advanced Biofuels in UK Road Transport.

Computational analysis of the effect of hydrogen peroxide addition on premixed laminar hydrogen/air flames (2021)
Journal Article
Tingas, E.-A. (2021). Computational analysis of the effect of hydrogen peroxide addition on premixed laminar hydrogen/air flames. Fuel, 302, Article 121081. https://doi.org/10.1016/j.fuel.2021.121081

In the current work, the effect of H2O2 addition on the flame structure, laminar flame speed and NOx emissions is investigated in the context of 1D laminar premixed H2/air flames at Tu = 300 and 600 K, p = 1 and 30 atm, = 0.5. Mathematical tools fro... Read More about Computational analysis of the effect of hydrogen peroxide addition on premixed laminar hydrogen/air flames.

The chemical dynamics of hydrogen/hydrogen peroxide blends diluted with steam at compression ignition relevant conditions (2021)
Journal Article
Tingas, E.-A. (2021). The chemical dynamics of hydrogen/hydrogen peroxide blends diluted with steam at compression ignition relevant conditions. Fuel, 296, Article 120594. https://doi.org/10.1016/j.fuel.2021.120594

In the current work, the use of hydrogen peroxide as an additive to hydrogen/air mixtures is proposed and explored computationally, in conditions relevant to compression ignition engines. The hydrogen/hydrogen peroxide blends are supplemented with st... Read More about The chemical dynamics of hydrogen/hydrogen peroxide blends diluted with steam at compression ignition relevant conditions.

Dynamics Analysis of a Jet-Fuel Surrogate and Development of a Skeletal Mechanism for Computational Fluid Dynamic Applications (2020)
Journal Article
Sharmin, N., & Tingas, E.-A. (2020). Dynamics Analysis of a Jet-Fuel Surrogate and Development of a Skeletal Mechanism for Computational Fluid Dynamic Applications. Journal of Energy Engineering, 146(6), Article 04020064. https://doi.org/10.1061/%28asce%29ey.1943-7897.0000714

The autoignition dynamics of a three-component surrogate jet fuel (66.2% n-dodecane, 15.8% n-proplylbenzene, 18.0% 1,3,5-trimethylcyclohexane) suitable for usage as Jet A-1 and RP-3 aviation fuels are analyzed, using the detailed mechanism of Liu et... Read More about Dynamics Analysis of a Jet-Fuel Surrogate and Development of a Skeletal Mechanism for Computational Fluid Dynamic Applications.

Computational Singular Perturbation Method and Tangential Stretching Rate Analysis of Large Scale Simulations of Reactive Flows: Feature Tracking, Time Scale Characterization, and Cause/Effect Identification. Part 1, Basic Concepts (2020)
Book Chapter
Valorani, M., Creta, F., Ciottoli, P. P., Malpica Galassi, R., Goussis, D. A., Najm, H. N., Paolucci, S., Im, H. G., Tingas, E.-A., Manias, D. M., Parente, A., Li, Z., & Grenga, T. (2020). Computational Singular Perturbation Method and Tangential Stretching Rate Analysis of Large Scale Simulations of Reactive Flows: Feature Tracking, Time Scale Characterization, and Cause/Effect Identification. Part 1, Basic Concepts. In H. Pitsch, & A. Attili (Eds.), Data Analysis for Direct Numerical Simulations of Turbulent Combustion (43-64). Springer. https://doi.org/10.1007/978-3-030-44718-2_3

This chapter provides a review of the basic ideas at the core of the Computational Singular Perturbation (CSP) method and the Tangential Stretching Rate (TSR) analysis. It includes a coherent summary of the theoretical foundations of these two method... Read More about Computational Singular Perturbation Method and Tangential Stretching Rate Analysis of Large Scale Simulations of Reactive Flows: Feature Tracking, Time Scale Characterization, and Cause/Effect Identification. Part 1, Basic Concepts.

Computational Singular Perturbation Method and Tangential Stretching Rate Analysis of Large Scale Simulations of Reactive Flows: Feature Tracking, Time Scale Characterization, and Cause/Effect Identification. Part 2, Analyses of Ignition Systems, Laminar and Turbulent Flames (2020)
Book Chapter
Valorani, M., Creta, F., Ciottoli, P. P., Malpica Galassi, R., Goussis, D. A., Najm, H. N., Paolucci, S., Im, H. G., Tingas, E.-A., Manias, D. M., Parente, A., Li, Z., & Grenga, T. (2020). Computational Singular Perturbation Method and Tangential Stretching Rate Analysis of Large Scale Simulations of Reactive Flows: Feature Tracking, Time Scale Characterization, and Cause/Effect Identification. Part 2, Analyses of Ignition Systems, Laminar and Turbulent Flames. In H. Pitsch, & A. Attili (Eds.), Data Analysis for Direct Numerical Simulations of Turbulent Combustion: From Equation-Based Analysis to Machine Learning (65-88). Springer. https://doi.org/10.1007/978-3-030-44718-2_4

Chapter 3 summarized the highlights of the concepts behind the CSP method and the TSR analysis. In this chapter, we will discuss a few applications of these techniques.

Screening gas‐phase chemical kinetic models: Collision limit compliance and ultrafast timescales (2020)
Journal Article
Yalamanchi, K. K., Tingas, E., Im, H. G., & Sarathy, S. M. (2020). Screening gas‐phase chemical kinetic models: Collision limit compliance and ultrafast timescales. International Journal of Chemical Kinetics, 52(9), 599-610. https://doi.org/10.1002/kin.21373

Detailed gas‐phase chemical kinetic models are widely used in combustion research, and many new mechanisms for different fuels and reacting conditions are developed each year. Recent works have highlighted the need for error checking when preparing s... Read More about Screening gas‐phase chemical kinetic models: Collision limit compliance and ultrafast timescales.

Computational investigation of rod-stabilized laminar premixed hydrogen–methane–air flames (2020)
Presentation / Conference Contribution
Hernandez Perez, F. E., Im, H. G., & Tingas, A. E. (2020, January). Computational investigation of rod-stabilized laminar premixed hydrogen–methane–air flames. Presented at AIAA Scitech 2020 Forum, Orlando, FL

A computational study of steady, rod-stabilized, inverted, lean, CH4-air and H2-CH4-air flames is conducted. For the CH4-air flames, either decreasing the inlet equivalence ratio or increasing the mean inflow velocity leads to a larger standoff dista... Read More about Computational investigation of rod-stabilized laminar premixed hydrogen–methane–air flames.

DNS of Lean Hydrogen Turbulent Premixed Flames at High Karlovitz Number Conditions (2020)
Presentation / Conference Contribution
Song, W., Hernandez Perez, F., Tingas, A.-E., & Im, H. G. (2020, January). DNS of Lean Hydrogen Turbulent Premixed Flames at High Karlovitz Number Conditions. Presented at AIAA Scitech 2020 Forum, Orlando, FL

To investigate the turbulent flame speed at high Karlovitz number (Ka) conditions, high fidelity direct numerical simulations (DNS) of lean hydrogen/air premixed flames propagating in a channel are performed with forced turbulence. The turbulent flame sp... Read More about DNS of Lean Hydrogen Turbulent Premixed Flames at High Karlovitz Number Conditions.

Computational singular perturbation analysis of brain lactate metabolism (2019)
Journal Article
Patsatzis, D. G., Tingas, E.-A., Goussis, D. A., & Sarathy, S. M. (2019). Computational singular perturbation analysis of brain lactate metabolism. PLOS ONE, 14(12), Article e0226094. https://doi.org/10.1371/journal.pone.0226094

Lactate in the brain is considered an important fuel and signalling molecule for neuronal activity, especially during neuronal activation. Whether lactate is shuttled from astrocytes to neurons or from neurons to astrocytes leads to the contradictory... Read More about Computational singular perturbation analysis of brain lactate metabolism.

Direct Numerical Simulation of Turbulent Hydrogen-Air Premixed Flames at Preheated and Diluted Donditions (2019)
Presentation / Conference Contribution
Song, W., Hernandez Perez, F. E., Tingas, S., & Im, H. (2019, November). Direct Numerical Simulation of Turbulent Hydrogen-Air Premixed Flames at Preheated and Diluted Donditions. Paper presented at 72nd Annual Meeting of the APS Division of Fluid Dynamics, Seattle, Washington, USA

Moderate or intense low-oxygen dilution (MILD) combustion is a promising concept to achieve high-performance and low-emission combustion simultaneously. In this study, we investigate the front propagation and burning characteristics in the MILD mode... Read More about Direct Numerical Simulation of Turbulent Hydrogen-Air Premixed Flames at Preheated and Diluted Donditions.

Algorithmic Analysis of Chemical Dynamics of the Autoignition of NH3–H2O2/Air Mixtures (2019)
Journal Article
Khalil, A. T., Manias, D. M., Tingas, E.-A., Kyritsis, D. C., & Goussis, D. A. (2019). Algorithmic Analysis of Chemical Dynamics of the Autoignition of NH3–H2O2/Air Mixtures. Energies, 12(23), Article 4422. https://doi.org/10.3390/en12234422

The dynamics of a homogeneous adiabatic autoignition of an ammonia/air mixture at constant volume was studied, using the algorithmic tools of Computational Singular Perturbation. Since ammonia combustion is characterized by both unrealistically long... Read More about Algorithmic Analysis of Chemical Dynamics of the Autoignition of NH3–H2O2/Air Mixtures.